DNA from a chain left behind after an Occupy Wall Street subway station protest in March gave police the biggest break they’ve had yet in the 8-year-old murder of a 21-year-old Juilliard student, according to an NBC News 4 exclusive..

Sarah Fox was found naked and strangled in Inwood Hill Park in May 2004. At the time, investigators found DNA left on Fox’s pink CD player, which was recovered in the woods near the crime scene.

Police recently found similar DNA on a chain protestors used in March to lock emergency gates at the Beverly Road subway station in East Flatbush.